| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/git/checkouts/incubator-teaclave-crates-c8106113f74feefc/ede1f68/ring/src/bits.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>bits.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../ring/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../ring/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="comment">// Copyright 2016 Brian Smith. |
| // |
| // Permission to use, copy, modify, and/or distribute this software for any |
| // purpose with or without fee is hereby granted, provided that the above |
| // copyright notice and this permission notice appear in all copies. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES |
| // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
| // SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| // OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| // CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::error; |
| |
| <span class="attribute">#[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd)] |
| </span><span class="kw">pub struct </span>BitLength(usize); |
| |
| <span class="comment">// Lengths measured in bits, where all arithmetic is guaranteed not to |
| // overflow. |
| </span><span class="kw">impl </span>BitLength { |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub const fn </span>from_usize_bits(bits: usize) -> <span class="self">Self </span>{ |
| <span class="self">Self</span>(bits) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>from_usize_bytes(bytes: usize) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, error::Unspecified> { |
| <span class="kw">let </span>bits = bytes.checked_mul(<span class="number">8</span>).ok_or(error::Unspecified)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(<span class="self">Self</span>::from_usize_bits(bits)) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] |
| #[inline] |
| </span><span class="kw">pub fn </span>half_rounded_up(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>round_up = <span class="self">self</span>.<span class="number">0 </span>& <span class="number">1</span>; |
| <span class="self">Self</span>((<span class="self">self</span>.<span class="number">0 </span>/ <span class="number">2</span>) + round_up) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>as_usize_bits(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.<span class="number">0 |
| </span>} |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] |
| #[inline] |
| </span><span class="kw">pub fn </span>as_usize_bytes_rounded_up(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="comment">// Equivalent to (self.0 + 7) / 8, except with no potential for |
| // overflow and without branches. |
| |
| // Branchless round_up = if self.0 & 0b111 != 0 { 1 } else { 0 }; |
| </span><span class="kw">let </span>round_up = ((<span class="self">self</span>.<span class="number">0 </span>>> <span class="number">2</span>) | (<span class="self">self</span>.<span class="number">0 </span>>> <span class="number">1</span>) | <span class="self">self</span>.<span class="number">0</span>) & <span class="number">1</span>; |
| |
| (<span class="self">self</span>.<span class="number">0 </span>/ <span class="number">8</span>) + round_up |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] |
| #[inline] |
| </span><span class="kw">pub fn </span>try_sub_1(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><BitLength, error::Unspecified> { |
| <span class="kw">let </span>sum = <span class="self">self</span>.<span class="number">0</span>.checked_sub(<span class="number">1</span>).ok_or(error::Unspecified)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(BitLength(sum)) |
| } |
| } |
| </code></pre></div> |
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